Mint Mark: Is either D (Denver Mint), No Mint (Philadelphia Mint), S (San Francisco Mint). The P mint mark was added to the coin in 1980 until the present.

The mint mark is located on the back and just above the R in QUARTER from 1932 to 1964, and 1965 to 1967 no mint mark was on the coins. Beginning in 1968 the mint mark was moved to the front of the coin and just behind Washington’s hair tie.